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It's always a good practice to look over your chair thoroughly before you sit down. Just sayin'.

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I have benzocained many North American bullfrogs over here. Its not worth doing unless you are systematically trying to wipe out an introduced population. Killing the odd individual will have no impact on the population. We took out 12,000 bullfrogs at a site in the UK where they were established and making a nuisance of themselves.

12,000! What did you do with the bodies, bury them? How did you do that, many people and one-on-one?
I don't think invasive species will ever be wiped out; they have no natural enemies where they are introduced.
Here in FL, there are campaigns to eradicate the Australian Pine and the Brazilian Pepperbush. Both of them make thousands of seeds to a plant, if not millions, so are almost impossible to control. Both were brought in as a windbreak and an ornamental bush. Once established, they spread like wildfire.

A lot of them were large tadpoles. we drained the pond they were in, collected up all the tadpoles and as many frogs as we could find (in January- cold fingers) killed them and then got the mechanical excavator we were using to dig a deep trench for all the bodies and the slop from the ponds abd buried them. Then we had several months of walking round the pond, which was surrounded by a frog proof fence catching any frogs we could see at night. That got rid of the easy to catch frogs and left the really shy ones that leapt into the pond when they saw you 10 m away. We took those out with guns. And just when the job was nearly done we found they had bred in another pond and we had to start again, though it was not so bad because most of the young were still tadpoles that time. At that point to save money on contractor fees I finished the job off myself, catching them at night with a net. I brought about 400 home and when they were dead they were buried in the garden. The last one was a pain. It was so shy I could not get near it, so in the end I had to position nets where it tended to jump. I walked away and came back an hour later and it duly obliged by jumping into the net. We have not seen any more there for 9 years. Luckily we found them before they had spread too far.

It was a sad case all round. The tadpoles were swimming with American rainbow trout, in a pond full of Canadian pond weed and Australian swamp stone crop, and visited by Canada geese! Oh, and pickerel weed too.

Pickerel weed is a big interloper in FL also. It clogs up the streams and canals. Like hunting the Pythons in the Everglades, people band together to strip it from the waters.

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